---
- name: Add APT key for Redis repository
  apt_key:
    url: https://packages.redis.io/gpg

- name: Add Redis APT repository
  apt_repository:
    repo: deb https://packages.redis.io/deb bookworm main

- name: Install Redis
  apt:
    name:
      - redis={{ redis_version }}
      - redis-server={{ redis_version }}
      - redis-tools={{ redis_version }}

- name: Remove redis-server from init.d (may conflict with systemd service)
  file:
    path: /etc/init.d/redis-server
    state: absent
  when: is_docker

- name: Update rc.d to reflect init.d removal
  command:
    cmd: update-rc.d redis-server remove
  when: is_docker

- name: Stop redis-server service installed through APT (if any)
  systemd_service:
    name: redis-server
    state: stopped
    enabled: false
  ignore_errors: true

- name: Create group for redis user
  group:
    name: redis

- name: Create redis user
  user:
    name: redis
    group: redis
    create_home: false

- name: Create /run/redis
  file:
    path: /run/redis
    state: directory
    owner: redis
    group: redis
    mode: 0755

- name: Create /var/lib/redis
  file:
    path: /var/lib/redis
    state: directory
    owner: redis
    group: redis
    mode: 0700

- name: Create /var/log/redis
  file:
    path: /var/log/redis
    state: directory
    owner: redis
    group: redis
    mode: 0744

- name: Create Redis configuration file
  template:
    src: redis.conf.jinja2
    dest: /etc/redis.conf
    owner: redis
    group: redis
    mode: 0600

- name: Create Redis service file
  copy:
    src: redis.service
    dest: /etc/systemd/system/redis.service
    owner: root
    group: root
    mode: 0644

- name: Add service file for disabling transparent hugepage
  copy:
    src: transparent_hugepage.service
    dest: /etc/systemd/system/transparent_hugepage.service
    owner: root
    group: root
    mode: 0644

- name: Check if transparent hugepage is currently enabled
  command:
    cmd: cat /sys/kernel/mm/transparent_hugepage/enabled
  register: transparent_hugepage
  changed_when: false

- name: Start and enable "disable transparent hugepage" service
  systemd_service:
    name: transparent_hugepage.service
    state: started
    enabled: true
  when: "'[never]' not in transparent_hugepage.stdout"
  ignore_errors: "{{ is_docker }}"

- name: Check if kernel overcommit mode is already set
  command:
    cmd: sysctl -n vm.overcommit_memory
  register: overcommit_memory
  changed_when: false

- name: Set kernel overcommit mode temporarily (recommended by Redis)
  command:
    cmd: sysctl vm.overcommit_memory=1
  when: overcommit_memory.stdout == "0"
  ignore_errors: "{{ is_docker }}"

- name: Make kernel overcommit mode permanent (recommended by Redis, requires restart)
  lineinfile:
    path: /etc/sysctl.conf
    line: vm.overcommit_memory = 1
  ignore_errors: "{{ is_docker }}"

- name: Start and enable redis service
  systemd_service:
    name: redis
    state: started
    enabled: true